/****************************************************************
 * <strong>MFJSEncode</strong>
 *
 * <p>
 * MFJSEncode
 * </p>
 *
 * @author AndyZhang 2011
 * @version 0.1
 * ToDo:
 ***************************************************************/
package com.thinkwide.data.security;

import com.thinkwide.data.core.MFString;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;

public class MFJSEncode {

    public static String base64Encode(String src) throws UnsupportedEncodingException {
        return new BASE64Encoder().encode(src.getBytes("utf-8"));
    }

    public static String base64Decode(String src) throws IOException {
        byte[] byteContent = new BASE64Decoder().decodeBuffer(src);

        return new String(byteContent, "utf-8");
    }

    public static String UrlEncode(String src, String chartSet) {

        try {
            return URLEncoder.encode(src, chartSet);

        } catch (UnsupportedEncodingException e) {

            e.printStackTrace();
        }
        return MFString.Empty;
    }

    public static String UrlDecode(String src, String chartSet) {

        try {
            return URLDecoder.decode(src, chartSet);

        } catch (UnsupportedEncodingException e) {

            e.printStackTrace();
        }
        return MFString.Empty;
    }

    public static String escape(String src) {
        int i;
        char j;
        StringBuffer tmp = new StringBuffer();
        tmp.ensureCapacity(src.length() * 6);
        for (i = 0; i < src.length(); i++) {
            j = src.charAt(i);

            if (Character.isDigit(j) || Character.isLowerCase(j) || Character.isUpperCase(j))
                tmp.append(j);
            else if (j < 256) {
                tmp.append("%");
                if (j < 16)
                    tmp.append("0");
                tmp.append(Integer.toString(j, 16));
            } else {
                tmp.append("%u");
                tmp.append(Integer.toString(j, 16));
            }
        }
        return tmp.toString();
    }


    public static String unescape(String src) {
        StringBuffer tmp = new StringBuffer();
        tmp.ensureCapacity(src.length());
        int lastPos = 0, pos = 0;
        char ch;

        while (lastPos < src.length()) {
            pos = src.indexOf("%", lastPos);
            if (pos == lastPos) {
                if (src.charAt(pos + 1) == 'u') {
                    ch = (char) Integer.parseInt(src.substring(pos + 2, pos + 6), 16);
                    tmp.append(ch);
                    lastPos = pos + 6;
                } else {
                    ch = (char) Integer.parseInt(src.substring(pos + 1, pos + 3), 16);
                    tmp.append(ch);
                    lastPos = pos + 3;
                }
            } else {
                if (pos == -1) {
                    tmp.append(src.substring(lastPos));
                    lastPos = src.length();
                } else {
                    tmp.append(src.substring(lastPos, pos));
                    lastPos = pos;
                }
            }
        }
        return tmp.toString();
    }
}
